Both DISH Network and Directv require a basic credit application in order to take advantage of their best promotions. It is not exactly black and white. What I mean is they are not specifically looking at a number, and that is it. They look at credit history, defaulted or late payments on similar services, and things like that.
If I had to guess I'd say 580 and above has a pretty good chance at qualifying. DISH Network has plans for customers who do not have good credit also. Check it out. I hope that helps.